Hell cannon

A hell cannon was the nickname given to an improvised artillery piece used by the Syrian Opposition during the Syrian Civil War, especially in the Battle of Aleppo and other urban battles. A towed and wheeled three-foot-long cannon barrel would be loaded with ammonium nitrate and other explosive powder, and gas canisters would be launcher from the hell cannons at the Syrian Arab Army. By December 2014, 20 cannons were in use.